Yes. I am an introvert who, by necessity, functions like an extrovert. I do this willingly, to meet the needs of my family, friends and job responsibilities. It is extremely difficult and over the years I've conditioned myself to forego sleep (get up very early and stay up very late, while the rest of the household is in bed) in order to have a few hours each day where nobody expects anything of me. On it's own, it's not enough and I've gotten to dark places where I'm so drained I fantasize about driving off forever to who-knows-where without even saying goodbye. This is NOT something I'd ever actually do, but it is a shrill alarm that can't be ignored. I've learned to take a few days away (or just as good, send my DH away for the weekend) at least once a year, or more often if necessary.